ESP32通过WEB页面连接WIFI+复位重连+删除已连WiFi（Arduino）

在ESP32官方的例程中，都是直接把WIFI的SSID和Password写死在程序里，但是在实际使用中网络环境是不固定的，如果更换了网络环境，就得重新修改程序，在实际运用中并不合理。我在网上找了很久也没找到类似的例程，于是便自己试着写了一个，我的思路如下：

首次上电会有一个ESP32发出的WIFI，手机连接这个WIFI，然后访问esp32的IP地址就会出现WIFI配置的网页：
由于ESP32默认会自动保存WiFi信息，配置WiFi之后我们不用考虑怎么保存WiFi。

下面是完整的程序

#include <WiFi.h>
#include <WebServer.h>
#include <ESPmDNS.h>
#include <esp_wifi.h>

const char* AP_SSID  = "ESP32_Config"; //热点名称
String wifi_ssid = "";
String wifi_pass = "";
String scanNetworksID = "";//用于储存扫描到的WiFi

#define ROOT_HTML  "
WiFi SSIDWiFi PASS 
 Nearby wifi:
"
WebServer server(80);

#define RESET_PIN   13  //用于删除WiFi信息

void setup() {

  Serial.begin(115200);
  pinMode(RESET_PIN, INPUT_PULLUP);

  // 连接WiFi
  if (!AutoConfig())
  {
    wifi_Config();
  }

  //用于删除已存WiFi
  if (digitalRead(RESET_PIN) == LOW) {
    delay(1000);
    esp_wifi_restore();
    delay(10);
    ESP.restart();  //复位esp32
  }
}

void loop() {
  server.handleClient();
  while (WiFi.status() == WL_CONNECTED) {
    //WIFI已连接

  }
}

//用于配置WiFi
void wifi_Config()
{
  Serial.println("scan start");
  // 扫描附近WiFi
  int n = WiFi.scanNetworks();
  Serial.println("scan done");
  if (n == 0) {
    Serial.println("no networks found");
    scanNetworksID = "no networks found";
  } else {
    Serial.print(n);
    Serial.println(" networks found");
    for (int i = 0; i < n; ++i) {
      // Print SSID and RSSI for each network found
      Serial.print(i + 1);
      Serial.print(": ");
      Serial.print(WiFi.SSID(i));
      Serial.print(" (");
      Serial.print(WiFi.RSSI(i));
      Serial.print(")");
      Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN) ? " " : "*");
      scanNetworksID += "
" + WiFi.SSID(i) + "
";
      delay(10);
    }
  }
  Serial.println("");

  WiFi.mode(WIFI_AP);//配置为AP模式
  boolean result = WiFi.softAP(AP_SSID, ""); //开启WIFI热点
  if (result)
  {
    IPAddress myIP = WiFi.softAPIP();
    //打印相关信息
    Serial.println("");
    Serial.print("Soft-AP IP address = ");
    Serial.println(myIP);
    Serial.println(String("MAC address = ")  + WiFi.softAPmacAddress().c_str());
    Serial.println("waiting ...");
  } else {  //开启热点失败
    Serial.println("WiFiAP Failed");
    delay(3000);
    ESP.restart();  //复位esp32
  }

  if (MDNS.begin("esp32")) {
    Serial.println("MDNS responder started");
  }

  //首页
  server.on("/", []() {
    server.send(200, "text/html", ROOT_HTML + scanNetworksID + "");
  });

  //连接
  server.on("/connect", []() {

    server.send(200, "text/html", "successd,wifi connecting...
Please close this page manually.");

    WiFi.softAPdisconnect(true);
    //获取输入的WIFI账户和密码
    wifi_ssid = server.arg("ssid");
    wifi_pass = server.arg("pass");
    server.close();
    WiFi.softAPdisconnect();
    Serial.println("WiFi Connect SSID:" + wifi_ssid + "  PASS:" + wifi_pass);

    //设置为STA模式并连接WIFI
    WiFi.mode(WIFI_STA);
    WiFi.begin(wifi_ssid.c_str(), wifi_pass.c_str());
    uint8_t Connect_time = 0; //用于连接计时，如果长时间连接不成功，复位设备
    while (WiFi.status() != WL_CONNECTED) {  //等待WIFI连接成功
      delay(500);
      Serial.print(".");
      Connect_time ++;
      if (Connect_time > 80) {  //长时间连接不上，复位设备
        Serial.println("Connection timeout, check input is correct or try again later!");
        delay(3000);
        ESP.restart();
      }
    }
    Serial.println("");
    Serial.println("WIFI Config Success");
    Serial.printf("SSID:%s", WiFi.SSID().c_str());
    Serial.print("  LocalIP:");
    Serial.print(WiFi.localIP());
    Serial.println("");

  });
  server.begin();
}

//用于上电自动连接WiFi
bool AutoConfig()
{
  WiFi.begin();
  for (int i = 0; i < 20; i++)
  {
    int wstatus = WiFi.status();
    if (wstatus == WL_CONNECTED)
    {
      Serial.println("WIFI SmartConfig Success");
      Serial.printf("SSID:%s", WiFi.SSID().c_str());
      Serial.printf(", PSW:%s\r\n", WiFi.psk().c_str());
      Serial.print("LocalIP:");
      Serial.print(WiFi.localIP());
      Serial.print(" ,GateIP:");
      Serial.println(WiFi.gatewayIP());
      return true;
    }
    else
    {
      Serial.print("WIFI AutoConfig Waiting......");
      Serial.println(wstatus);
      delay(1000);
    }
  }
  Serial.println("WIFI AutoConfig Faild!" );
  return false;
}